TOKYO, Sept 29 (Reuters) - Imports of Iranian crude by major buyers in Asia rose for a second month in a row in August to hit their highest level since March, helped by a spike in purchases However, imports by Asia's four main buyers remained below year ago levels for a fourth month in a row, the first time this has happened since Western sanctions against Tehran were lifted in January last year, leading to a surge in shipments. China, India, South Korea and Japan together imported 1.64 million barrels per day (bpd) last month, down 10.8 percent on a year ago, government and ship-tracking data showed. Iran aims to maintain crude oil and condensate exports at around 2.6 million bpd for the rest of 2017 although recent maintenance, depleted oil storage and a growing domestic appetite will limit shipments abroad, a senior official at the national state oil company said on Monday. Chinese imports rose 5.5 percent from a year ago last month to 786,720 bpd, the highest monthly amount since 2006, according to data on Reuters Eikon. South Korea's imports jumped 46.7 percent to a five-month high of 407,323 bpd. India, however, continued to reduce its intake in retaliation at Tehran's decision to award a giant gas field to a Russian company. India imported 335,400 bpd in August, the lowest level since February 2016, and down about 42 percent from a year ago. Japan's Iranian imports fell for a fourth straight month from a year ago to 107,357 bpd, the lowest volumes since April, trade ministry data showed on Friday. Iran has been exempted from an agreement by the Organization of the Petroleum Exporting Countries (OPEC) to reduce output, a victory for Tehran which has argued it needs to regain the market share it lost under Western sanctions over its disputed nuclear programme. Iran is aiming to raise oil output to around 4 million bpd from around 3.8 million bpd in recent months.

The following tables show Asia's Iran crude imports in bpd for last month and the year to date.